I just wanted to post an update about installing nvidia drivers.
If your graphic card is new, just install modules posted from the first part of tutorial.
If your graphic card might be old, before installing any packages use the nvidia-detect tool to check which driver to use - if it's an old (legacy) driver you just need to change the "173xx" to that version shown in the output. At the moment, there are two versions of legacy driver 173xx and 304xx.
After the installation is finished you'll get a message about the need to add the new driver to you xorg.conf file whitout help on how to do it.
DO NOT USE THE nvidia-xconfig tool!! If you use it, after a reboot you'll stuck without a working X server.

What you have to do is:
open terminal and type:
sudo nano -w /etc/X11/xorg.conf
or if you don't like the terminal, press alt+f2 and type:
gksu gedit /etc/X11/xorg.conf
an empty file will open
2. paste the following lines
Section "Device"
Identifier "Device0"
Driver "nvidia"
EndSection

e.g.
This is a dynabook i7 with Nvidia GTS350 graphics (low end) and LinuxMint 17 has Xorg drivers intalled via the auto-select at the install a few days ago; but there is an Nvidia 331 driver on Driver Manager which indicates "recommended", but why would LinuxMint 17 not install the Recommended driver during the install?

Sorry but this approach did not work for me under the latest 201204RC. I have Alienware M11x with GT540M GPU. I also installed the driver manually but in either case I get a blank screen after booting up (both in standard and recovery mode). Any suggestion on what could cause the problem and maybe how to fix it? Should I roll back to 201109 and update the system that way? Could it be a 64-bit vs a 32-bit issue with the base OS?

1. Even if you forget to execute $sudo nvidia-xconfig here is how to go about
Boot into recovery mode, enter su password
enter command sudo nvidia-xconfig
2. Remove nouveau driver $sudo apt-get purge xserver-xorg-video-nouveau libdrm-nouveau1a
3. Reboot and there you are with new nvidia driver loaded

Could you make fan control tutorial? I can change fan sped from 100 to 40 but when I restart PC, speed is back to 100. So I need permanent solution. And also I have to run command $ nvclock -F 40 -f few times to begin working.